CM18 postcode district: Harlow and around, Essex

CM18 is a postcode district in Essex, with 430 postcodes in use in 2 sectors. It has postcodes in Harlow. It is split between 2 councils: Harlow (427 postcodes) and Epping Forest (3).

Postcodes in use
430
Sectors
2
Councils
2 councils
Places
Harlow

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in CM18, by flood risk

Map of every postcode in CM18, by flood risk Of the 430 postcodes in CM18 that ONS places, 1 are at medium risk at worst and 429 are not on the Environment Agency's at-risk list. 3 postcodes lie beyond the edge and are listed under the map. Places named: Bush Fair, Latton Bush & Stewards. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. A414A1025 CM18 6AA: not on the flood risk listCM18 6AB: not on the flood risk listCM18 6AD: not on the flood risk listCM18 6AE: not on the flood risk listCM18 6AF: not on the flood risk listCM18 6AG: not on the flood risk listCM18 6AH: not on the flood risk listCM18 6AJ: not on the flood risk listCM18 6AL: not on the flood risk listCM18 6AN: not on the flood risk listCM18 6AP: not on the flood risk listCM18 6AQ: not on the flood risk listCM18 6AR: not on the flood risk listCM18 6AS: not on the flood risk listCM18 6AT: not on the flood risk listCM18 6AU: not on the flood risk listCM18 6AW: not on the flood risk listCM18 6BA: not on the flood risk listCM18 6BB: not on the flood risk listCM18 6BD: not on the flood risk listCM18 6BE: not on the flood risk listCM18 6BG: not on the flood risk listCM18 6BJ: not on the flood risk listCM18 6BL: not on the flood risk listCM18 6BN: not on the flood risk listCM18 6BW: not on the flood risk listCM18 6BX: not on the flood risk listCM18 6BY: not on the flood risk listCM18 6BZ: not on the flood risk listCM18 6DA: not on the flood risk listCM18 6DB: not on the flood risk listCM18 6DD: not on the flood risk listCM18 6DE: not on the flood risk listCM18 6DF: not on the flood risk listCM18 6DL: not on the flood risk listCM18 6DN: not on the flood risk listCM18 6DP: not on the flood risk listCM18 6DR: not on the flood risk listCM18 6DS: not on the flood risk listCM18 6DT: not on the flood risk listCM18 6DU: not on the flood risk listCM18 6DW: not on the flood risk listCM18 6DX: not on the flood risk listCM18 6DY: not on the flood risk listCM18 6DZ: not on the flood risk listCM18 6EA: not on the flood risk listCM18 6EB: not on the flood risk listCM18 6ED: not on the flood risk listCM18 6EE: not on the flood risk listCM18 6EF: not on the flood risk listCM18 6EG: not on the flood risk listCM18 6EN: not on the flood risk listCM18 6EP: not on the flood risk listCM18 6ER: not on the flood risk listCM18 6ES: not on the flood risk listCM18 6ET: not on the flood risk listCM18 6EU: not on the flood risk listCM18 6EW: not on the flood risk listCM18 6EX: not on the flood risk listCM18 6EY: not on the flood risk listCM18 6EZ: not on the flood risk listCM18 6FA: not on the flood risk listCM18 6FE: not on the flood risk listCM18 6FF: not on the flood risk listCM18 6FH: not on the flood risk listCM18 6FJ: not on the flood risk listCM18 6GB: not on the flood risk listCM18 6HA: not on the flood risk listCM18 6HB: not on the flood risk listCM18 6HD: not on the flood risk listCM18 6HE: not on the flood risk listCM18 6HG: not on the flood risk listCM18 6HH: not on the flood risk listCM18 6HJ: not on the flood risk listCM18 6HL: not on the flood risk listCM18 6HN: not on the flood risk listCM18 6HP: not on the flood risk listCM18 6HQ: not on the flood risk listCM18 6HR: not on the flood risk listCM18 6HW: not on the flood risk listCM18 6JA: not on the flood risk listCM18 6JB: not on the flood risk listCM18 6JD: not on the flood risk listCM18 6JE: not on the flood risk listCM18 6JF: not on the flood risk listCM18 6JG: not on the flood risk listCM18 6JH: not on the flood risk listCM18 6JJ: not on the flood risk listCM18 6JN: not on the flood risk listCM18 6JP: not on the flood risk listCM18 6JQ: not on the flood risk listCM18 6JR: not on the flood risk listCM18 6JS: not on the flood risk listCM18 6JT: not on the flood risk listCM18 6JU: not on the flood risk listCM18 6JW: not on the flood risk listCM18 6JX: not on the flood risk listCM18 6JY: not on the flood risk listCM18 6JZ: not on the flood risk listCM18 6LA: not on the flood risk listCM18 6LB: not on the flood risk listCM18 6LD: not on the flood risk listCM18 6LN: not on the flood risk listCM18 6LP: not on the flood risk listCM18 6LT: not on the flood risk listCM18 6LU: not on the flood risk listCM18 6LW: not on the flood risk listCM18 6LX: not on the flood risk listCM18 6LY: not on the flood risk listCM18 6NA: not on the flood risk listCM18 6NG: not on the flood risk listCM18 6NN: not on the flood risk listCM18 6NQ: not on the flood risk listCM18 6NR: not on the flood risk listCM18 6NS: not on the flood risk listCM18 6NW: not on the flood risk listCM18 6NZ: not on the flood risk listCM18 6PA: not on the flood risk listCM18 6PB: not on the flood risk listCM18 6PD: not on the flood risk listCM18 6PE: not on the flood risk listCM18 6PF: not on the flood risk listCM18 6PG: not on the flood risk listCM18 6PH: not on the flood risk listCM18 6PJ: not on the flood risk listCM18 6PN: not on the flood risk listCM18 6PQ: not on the flood risk listCM18 6PX: not on the flood risk listCM18 6QA: not on the flood risk listCM18 6QB: not on the flood risk listCM18 6QD: not on the flood risk listCM18 6QE: not on the flood risk listCM18 6QF: not on the flood risk listCM18 6QG: not on the flood risk listCM18 6QJ: not on the flood risk listCM18 6QL: not on the flood risk listCM18 6QN: not on the flood risk listCM18 6QP: not on the flood risk listCM18 6QQ: not on the flood risk listCM18 6QR: not on the flood risk listCM18 6QS: not on the flood risk listCM18 6QT: not on the flood risk listCM18 6QU: not on the flood risk listCM18 6QW: not on the flood risk listCM18 6QY: not on the flood risk listCM18 6QZ: not on the flood risk listCM18 6RB: not on the flood risk listCM18 6RF: not on the flood risk listCM18 6RG: not on the flood risk listCM18 6RH: not on the flood risk listCM18 6RJ: not on the flood risk listCM18 6RN: not on the flood risk listCM18 6RQ: not on the flood risk listCM18 6RR: not on the flood risk listCM18 6RS: not on the flood risk listCM18 6RT: not on the flood risk listCM18 6RU: not on the flood risk listCM18 6RX: not on the flood risk listCM18 6RY: not on the flood risk listCM18 6RZ: not on the flood risk listCM18 6SA: not on the flood risk listCM18 6SB: not on the flood risk listCM18 6SD: not on the flood risk listCM18 6SH: not on the flood risk listCM18 6SL: not on the flood risk listCM18 6SN: not on the flood risk listCM18 6SP: not on the flood risk listCM18 6SR: not on the flood risk listCM18 6SS: not on the flood risk listCM18 6ST: not on the flood risk listCM18 6SU: not on the flood risk listCM18 6SW: not on the flood risk listCM18 6SX: not on the flood risk listCM18 6SY: not on the flood risk listCM18 6TD: not on the flood risk listCM18 6TE: not on the flood risk listCM18 6TF: not on the flood risk listCM18 6TG: not on the flood risk listCM18 6TH: not on the flood risk listCM18 6TJ: not on the flood risk listCM18 6TL: not on the flood risk listCM18 6TN: not on the flood risk listCM18 6TP: not on the flood risk listCM18 6TQ: not on the flood risk listCM18 6TR: not on the flood risk listCM18 6TS: not on the flood risk listCM18 6TW: not on the flood risk listCM18 6TZ: not on the flood risk listCM18 6UA: not on the flood risk listCM18 6UB: not on the flood risk listCM18 6UD: not on the flood risk listCM18 6UE: not on the flood risk listCM18 6UF: not on the flood risk listCM18 6UG: not on the flood risk listCM18 6UJ: not on the flood risk listCM18 6UL: not on the flood risk listCM18 6UN: not on the flood risk listCM18 6UP: not on the flood risk listCM18 6UR: not on the flood risk listCM18 6UT: not on the flood risk listCM18 6UW: not on the flood risk listCM18 6UX: not on the flood risk listCM18 6UY: not on the flood risk listCM18 6UZ: not on the flood risk listCM18 6XA: not on the flood risk listCM18 6XB: not on the flood risk listCM18 6XD: not on the flood risk listCM18 6XJ: not on the flood risk listCM18 6XL: not on the flood risk listCM18 6XN: not on the flood risk listCM18 6XP: not on the flood risk listCM18 6XR: not on the flood risk listCM18 6XS: not on the flood risk listCM18 6XT: not on the flood risk listCM18 6XU: not on the flood risk listCM18 6XW: not on the flood risk listCM18 6XX: not on the flood risk listCM18 6XY: not on the flood risk listCM18 6XZ: not on the flood risk listCM18 6YA: not on the flood risk listCM18 6YB: not on the flood risk listCM18 6YD: not on the flood risk listCM18 6YE: not on the flood risk listCM18 6YG: not on the flood risk listCM18 6YJ: not on the flood risk listCM18 6YQ: not on the flood risk listCM18 7AA: not on the flood risk listCM18 7AB: not on the flood risk listCM18 7AD: not on the flood risk listCM18 7AE: not on the flood risk listCM18 7AF: not on the flood risk listCM18 7AG: not on the flood risk listCM18 7AH: not on the flood risk listCM18 7AJ: not on the flood risk listCM18 7AL: not on the flood risk listCM18 7AN: not on the flood risk listCM18 7AP: not on the flood risk listCM18 7AQ: not on the flood risk listCM18 7AS: not on the flood risk listCM18 7AT: not on the flood risk listCM18 7AU: not on the flood risk listCM18 7AW: not on the flood risk listCM18 7AX: not on the flood risk listCM18 7AY: not on the flood risk listCM18 7AZ: not on the flood risk listCM18 7BA: not on the flood risk listCM18 7BH: not on the flood risk listCM18 7BJ: not on the flood risk listCM18 7BL: not on the flood risk listCM18 7BN: not on the flood risk listCM18 7BP: not on the flood risk listCM18 7BS: not on the flood risk listCM18 7BT: not on the flood risk listCM18 7BU: not on the flood risk listCM18 7BW: not on the flood risk listCM18 7BX: not on the flood risk listCM18 7BY: not on the flood risk listCM18 7DB: not on the flood risk listCM18 7DD: not on the flood risk listCM18 7DE: not on the flood risk listCM18 7DF: not on the flood risk listCM18 7DG: not on the flood risk listCM18 7DH: not on the flood risk listCM18 7DL: not on the flood risk listCM18 7DN: not on the flood risk listCM18 7DP: not on the flood risk listCM18 7DQ: not on the flood risk listCM18 7DR: not on the flood risk listCM18 7DS: not on the flood risk listCM18 7DT: not on the flood risk listCM18 7DU: not on the flood risk listCM18 7DW: not on the flood risk listCM18 7DX: not on the flood risk listCM18 7DY: not on the flood risk listCM18 7DZ: not on the flood risk listCM18 7EA: not on the flood risk listCM18 7EB: not on the flood risk listCM18 7ED: not on the flood risk listCM18 7EE: not on the flood risk listCM18 7EF: not on the flood risk listCM18 7EG: not on the flood risk listCM18 7EH: not on the flood risk listCM18 7EN: not on the flood risk listCM18 7EP: not on the flood risk listCM18 7EQ: not on the flood risk listCM18 7ER: not on the flood risk listCM18 7ES: not on the flood risk listCM18 7ET: not on the flood risk listCM18 7EU: not on the flood risk listCM18 7EY: not on the flood risk listCM18 7EZ: not on the flood risk listCM18 7FE: not on the flood risk listCM18 7FF: not on the flood risk listCM18 7FG: not on the flood risk listCM18 7FH: not on the flood risk listCM18 7FJ: not on the flood risk listCM18 7FL: not on the flood risk listCM18 7FN: not on the flood risk listCM18 7FP: not on the flood risk listCM18 7FQ: not on the flood risk listCM18 7FR: not on the flood risk listCM18 7FS: not on the flood risk listCM18 7FT: not on the flood risk listCM18 7FU: not on the flood risk listCM18 7FW: not on the flood risk listCM18 7FX: not on the flood risk listCM18 7FY: not on the flood risk listCM18 7GY: not on the flood risk listCM18 7HA: not on the flood risk listCM18 7HB: not on the flood risk listCM18 7HD: not on the flood risk listCM18 7HE: not on the flood risk listCM18 7HF: not on the flood risk listCM18 7HG: not on the flood risk listCM18 7HH: not on the flood risk listCM18 7HJ: not on the flood risk listCM18 7HL: not on the flood risk listCM18 7HN: not on the flood risk listCM18 7HP: not on the flood risk listCM18 7HQ: not on the flood risk listCM18 7HR: not on the flood risk listCM18 7HS: not on the flood risk listCM18 7HT: not on the flood risk listCM18 7HU: not on the flood risk listCM18 7HX: not on the flood risk listCM18 7HY: not on the flood risk listCM18 7HZ: not on the flood risk listCM18 7JA: not on the flood risk listCM18 7JB: not on the flood risk listCM18 7JD: not on the flood risk listCM18 7JE: not on the flood risk listCM18 7JF: not on the flood risk listCM18 7JH: not on the flood risk listCM18 7JL: not on the flood risk listCM18 7JN: not on the flood risk listCM18 7JS: not on the flood risk listCM18 7JT: not on the flood risk listCM18 7JU: not on the flood risk listCM18 7LH: not on the flood risk listCM18 7LJ: not on the flood risk listCM18 7LP: not on the flood risk listCM18 7LR: not on the flood risk listCM18 7LW: not on the flood risk listCM18 7ND: not on the flood risk listCM18 7NF: not on the flood risk listCM18 7NG: not on the flood risk listCM18 7NH: not on the flood risk listCM18 7NJ: not on the flood risk listCM18 7NL: not on the flood risk listCM18 7NN: not on the flood risk listCM18 7NP: not on the flood risk listCM18 7NQ: not on the flood risk listCM18 7NR: not on the flood risk listCM18 7NS: not on the flood risk listCM18 7NT: not on the flood risk listCM18 7NU: not on the flood risk listCM18 7NW: not on the flood risk listCM18 7NX: not on the flood risk listCM18 7NY: not on the flood risk listCM18 7NZ: not on the flood risk listCM18 7PA: not on the flood risk listCM18 7PB: not on the flood risk listCM18 7PD: not on the flood risk listCM18 7PE: not on the flood risk listCM18 7PF: not on the flood risk listCM18 7PG: not on the flood risk listCM18 7PJ: not on the flood risk listCM18 7PP: not on the flood risk listCM18 7PQ: not on the flood risk listCM18 7PS: not on the flood risk listCM18 7PT: not on the flood risk listCM18 7PU: not on the flood risk listCM18 7PX: not on the flood risk listCM18 7PY: not on the flood risk listCM18 7PZ: not on the flood risk listCM18 7QA: not on the flood risk listCM18 7QB: not on the flood risk listCM18 7QD: not on the flood risk listCM18 7QE: not on the flood risk listCM18 7QF: not on the flood risk listCM18 7QG: not on the flood risk listCM18 7QH: not on the flood risk listCM18 7QJ: not on the flood risk listCM18 7QL: not on the flood risk listCM18 7QN: not on the flood risk listCM18 7QP: not on the flood risk listCM18 7QQ: not on the flood risk listCM18 7QR: not on the flood risk listCM18 7QW: not on the flood risk listCM18 7QY: not on the flood risk listCM18 7QZ: not on the flood risk listCM18 7RA: not on the flood risk listCM18 7RB: not on the flood risk listCM18 7RD: not on the flood risk listCM18 7RE: not on the flood risk listCM18 7RF: not on the flood risk listCM18 7RG: not on the flood risk listCM18 7RH: not on the flood risk listCM18 7RJ: not on the flood risk listCM18 7RL: not on the flood risk listCM18 7RN: not on the flood risk listCM18 7RP: not on the flood risk listCM18 7RQ: not on the flood risk listCM18 7RR: not on the flood risk listCM18 7RS: not on the flood risk listCM18 7RT: not on the flood risk listCM18 7RU: not on the flood risk listCM18 7RW: not on the flood risk listCM18 7SA: not on the flood risk listCM18 7SB: not on the flood risk listCM18 7SD: not on the flood risk listCM18 7SE: not on the flood risk listCM18 7SF: not on the flood risk listCM18 7SG: not on the flood risk listCM18 7SH: not on the flood risk listCM18 7SL: not on the flood risk listCM18 7SQ: not on the flood risk listCM18 7SR: not on the flood risk listCM18 7SS: not on the flood risk listCM18 7ST: not on the flood risk listCM18 7SU: not on the flood risk listCM18 7SX: not on the flood risk listCM18 7SY: not on the flood risk listCM18 7TA: not on the flood risk listCM18 7TE: not on the flood risk listCM18 6YL: medium flood risk at worst Bush FairLatton Bush & Stewards Map of every postcode in CM18, by flood risk Of the 430 postcodes in CM18 that ONS places, 1 are at medium risk at worst and 429 are not on the Environment Agency's at-risk list. 3 postcodes lie beyond the edge and are listed under the map. Places named: Bush Fair, Latton Bush & Stewards. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. Bush FairLatton Bush & Stewards
  • A home or business at high risk: 0
  • At medium risk at worst: 1
  • At low risk at worst: 0
  • At very low risk only: 0
  • Not on the at-risk list: 429

Of the 430 postcodes in CM18 that ONS places, 1 are at medium risk at worst and 429 are not on the Environment Agency's at-risk list.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 51.7552, longitude 0.1061. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; flood risk: Environment Agency, published 6 July 2026; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The postcodes at medium risk at worst

Beside each: how many of its homes and businesses the Environment Agency puts at that risk.

CM18 6YL1 at medium risk

3 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

CM18 7FBCM18 7JGCM18 7JQ

What broadband can you get in CM18?

Ofcom reports on 425 of the 430 postcodes in CM18. At 324 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit324 of 425
Postcodes where every home can get superfast406 of 425

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is CM18 at risk of flooding?

1 of the 430 postcodes in CM18 has a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 1 home or business in an area at high or medium risk.

Homes and businesses in an area at risk, at 1 of 430 postcodes Medium: 1Low: 2

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in CM18?

Homes in CM18 sold for a typical £325,000 in the 12 months to August 2026, across 223 sales, up 1.2% on the 12 months before, HM Land Registry's figures show.

£325,000 typical price, the 12 months to August 2026
12 months to August 2025
£321,000
12 months to August 2026
£325,000

▲ up 1.2% on the 12 months before

Detached£497,500 13 sales
Semi-detached£411,000 27 sales
Terraced£325,000 148 sales
Flat or maisonette£190,000 35 sales

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in CM18

Pick a sector, then a postcode. A sector is the district plus the next digit.

CM18 6227 postcodesCM18 7203 postcodes
UK postcode format explained

Places in CM18

Towns and villages with postcodes in CM18, and how many each has here.

Harlow postcodes,428

Who covers CM18

How many of the district's postcodes in use fall under each council, constituency and police force area.

Councils

What council am I in?

Constituencies

  • Harlow428
  • Epping Forest2

Police force areas

  • Essex430

Next to CM18

CM17 postcode district CM19 postcode district All CM districts Harlow postcodes

"Next to" is by number: the districts before and after CM18 in the CM area.

Check a postcode

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